Terra Firma Automotive offers the HKS GTIII-RS Sports Turbo Kit for Nissan Skyline R33 and R34 models equipped with the RB25DET engine, providing a comprehensive, high-performance turbo upgrade for enthusiasts seeking maximum power, reliability, and streetable performance. Released in August 2025, this bolt-on kit replaces the factory turbo system entirely while maintaining OEM-like fitment and under-hood clearance. It is engineered for drivers upgrading from stock or older HKS GT-series turbos for street, track, or high-boost applications, delivering significant improvements in response, airflow, and throttle precision.
The GTIII-RS elevates engine output from approximately 280 PS to 330–450 PS with proper internal engine reinforcements. Refined compressor wheels and reinforced actuators ensure faster spool-up by 500–1,000 RPM, higher safe boost levels, and 20–50% more power without excessive thermal stress. Optimized exhaust flow and boost control allow for broader, more linear power delivery across the RPM range, improving mid-range torque, turbo responsiveness, and overall drivability. Compared to previous HKS GT III kits, the RS variant is designed to handle sustained high-boost conditions, making it ideal for modern setups using E85 fuel or upgraded injectors while minimizing turbine surge and extending component life.
Constructed from heat-resistant materials and reinforced with protective shields, this kit maintains visual subtlety while enhancing durability for performance-focused builds. The GTIII-RS includes the turbocharger, custom inlet and outlet pipes, lines, and mounting hardware, allowing direct replacement with factory mounts. Installation requires flushing and priming of oil and water lines, followed by professional ECU tuning to prevent over-boost or detonation. Terra Firma Automotive guarantees genuine HKS components, providing RB25DET owners with a race-proven solution that balances heritage GT engineering, modern tuning capabilities, and reliable high-output performance.
- 330 Hp (stock engine); up to 450 Hp (reinforced internals)
- Billet compressor wheel, Inconel turbine housing
- Matches OEM footprint (compact for ER34 engine bay)
- GT III-RS (reinforced actuator)
- Kit Contains GT III-RS turbo, exclusive outlet pipe, heat shield, water/oil lines, gaskets, adapter pipe, hardware (bolts/clamps)
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